The STC15W408AS-35I-DIP20 is a single-chip microcontroller unit (MCU) manufactured by STC. It is RoHS-compliant and comes in a DIP-20 package. This unit is based on the STC15W4 series of 20-pin MCUs, offering high performance and a wide range of integrated features that make it suitable for various applications. It offers a maximum operating frequency of up to 35 MHz, 128-KB flash memory, 4-KB of SRAM, and 2-KB data EEPROM. It also contains a UART, 2-channel SPIs, and 2-channel I2Cs, as well as a wide range of versatile I/O ports. In addition, it can support an external interrupt and a range of programmable Timers/Counters. This MCU is suitable for low-power real-time applications.